How many different 3- digit whole numbers can be formed using the digits 4,7 and 9, assuming that no digit can be repeated in a number?
Answer Choices
A. 6
B. 3
C. 5
D. 12
E. 9
How many different 3- digit whole numbers can be formed using the digits 4,7 and 9, assuming that no digit can be repeated in a number?
Answer Choices
A. 6
B. 3
C. 5
D. 12
E. 9